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Actually there's a trick to figure out the missing number in that one mathemagic. The number is dividable by 9 wich means all the multiplications will be dividable by 9 also. When the volunteers say the numbers outloud, all he has to do is to apply the rule of 9 and add all numbers up. Subtract that number from 9 and you know what the missing number is.

You guys know the real Rainman? Kim Peek! He can read a book in an hour and remember 98% of it for the rest of his life.

http://en.wikipedia.org/wiki/Kim_Peek